Mechanical Engineering Objective Questions { Production Technology }

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43. Weaving in arc welding refers to

A. Side to side motion of electrode at right angles to the direction of the welding

B. Side to side motion of electrode along the direction of the welding

C. Spiral motion given to electrode

D. A technique of striking the arc

44. The main criterion for selection of electrode diameter in arc welding is

A. Material to be welded

B. Type of welding process

C. Thickness of material

D. Voltage used

45. Weld spalter is

B. Electrode coating

C. Welding defect

D. Welding test

46. Arc blow occurs in

C. Arc welding when straight polarity is used

D. Arc welding when reverse polarity is used

47. Low hydrogen electrodes are baked prior to use in order that

A. Proper strength in obtained

B. Welding is free from arc blow

C. Welding is free from moisture pick up

D. Current required is minimum

48. Gray iron is usually welded by

C. Resistance welding

49. Stud and projection welding belong to the following category of welding

C. Resistance welding

D. Pressure welding

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